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Micro-bubbles are of significant interest due to the long-living signaturethey leave behind naval ships. In order to numerically model and predict thesebubbles in naval applications, subgrid-scale models are required because of theextreme separation of length- and time-scales between the macroscopicgeometries and the physical processes leading to the formation of thesebubbles. Yet, there is much that is unknown about the mechanism behind theentrainment of such bubbles. Furthermore, quantitative information regardingtheir size distribution and dependence on flow parameters is very limited.Impact events are hypothesized to be the main contributor to the generation ofmicro-bubbles. This is due to a phenomenon known as Mesler entrainment, whichhas been observed in the context of the drop-pool impact problem. Namely, whena water droplet with diameter of $\mathcal{O}(1mm)$ impacts a deep water poolwith an impact velocity of $\mathcal{O}(1m/s)$, hundreds of air micro-bubblesare entrained into the pool. These bubbles have been found to be remnants of avery thin air film entrapped between the two liquid bodies. These films haveextremely high aspect ratios and after being punctured, shed micro-bubbleswhile retracting on time scales much shorter than the outer flow time scales.This separation of time-scales, along with a lacking of studies on retractingthin gas films has motivated us to study this fundamental problem withnumerical simulations in two and three dimensions. Using a diffuse interfacemethod, we perform two-phase simulations of retracting thin gas films ininitially static liquid backgrounds to gain understanding regarding thisproblem and gather statistics that can be potentially used in a subgrid-scalemodel to predict micro-bubble shedding from a thin gas film. Coupling a modellike this to a model that predicts the thin film characteristics ...

High Fidelity Simulations of Micro-Bubble Shedding from Retracting Thin Gas Films in the Context of Liquid-Liquid Impact